Electrical Machines
Regenerative braking is possible in

  DC shunt motor with field weakening control.
 DC series motor.
 DC shunt motor with armature resistance control.
 DC compound motor.

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Electrical Machines
Skewing of the rotor in a 3 - Φ squirrel cage induction motor reduces

  noise and pullout torque, but increase parasitic and starting torque.
  noise, parasitic and starting torque, but increase pull out torque.
  noise and parasitic torque, but increase starting and pull-out torque.
  noise, parasitic torque, starting torque and pull out torque.

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